Okla. Stat. tit. 15, § 15-55: Duress defined

Duress consists in:

1. Unlawful confinement of the person of the party, or of

husband or wife of such party, or of an ancestor, descendant, or

adopted child of such party, husband or wife.

2. Unlawful detention of the property of any such person; or,

3. Confinement of such person, lawful in form, but fraudulently

obtained, or fraudulently made unjustly, harassing or oppressive.